style.css

* {
  margin: 0;
  padding: 0;
}
body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}
#canvas-parent {
  width: 100vw;
  height: 100vh;
  touch-action: none;
}
#guide {
  position: fixed;
  top: 0;
  right: 0;
  width: 300px;
  padding: 1rem 2rem;
  font-family:'Courier New', Courier, monospace;
  line-height: 1.2;
  background-color: white;
  color: black;
}

#guide p {
  margin-top: 10px;
}

#stats-widget {
  position: absolute;
  top: 70px;
  left: 10px;
  background-color: rgb(255 255 255 / 83%);
  padding: 10px;
  width: 300px;
  word-break: break-all;
  visibility: hidden;
}
#button {
  position: fixed;
  bottom: 16px;
  right: 16px;
  padding: 12px;
  border-radius: 50%;
  margin-bottom: 0px;
  background-color: #FFF;
  opacity: .9;
  z-index: 999;
  box-shadow: 0 0 4px rgb(0 0 0 / 15%);
}
@media (max-width:480px) {
  #guide, #stats-widget { display: none; }
}